RFR: 8191326/8191327/8191329: Deprecate SafepointSpinBeforeYield/DeferThrSuspendLoopCount/DeferPollingPageLoopCount

[Robbin Ehn]

Hi please review,

Parent issue: 8191325: Deprecate unstable options for SafepointSynchronize:
https://bugs.openjdk.java.net/browse/JDK-8191325

8191326: Deprecate SafepointSpinBeforeYield
Issue: https://bugs.openjdk.java.net/browse/JDK-8191326
CSR:   https://bugs.openjdk.java.net/browse/JDK-8191330

8191327: Deprecate DeferThrSuspendLoopCount
Issue: https://bugs.openjdk.java.net/browse/JDK-8191327
CSR:   https://bugs.openjdk.java.net/browse/JDK-8191331

8191329: Deprecate DeferPollingPageLoopCount
Issue: https://bugs.openjdk.java.net/browse/JDK-8191329
CSR:   https://bugs.openjdk.java.net/browse/JDK-8191336

Code:
http://cr.openjdk.java.net/~rehn/8191325/webrev/

Thanks Robbin